Holding the high ground has its perks. This is how the Yankees viewed the Rebs from Little Round Top. Those big rocks left of center are Devil's Den. The roads are modern.
Such is the name of this part of the Gettysburg battlefield. The area on the near side of the stone wall was the scene of hand-to-hand fighting as Pickett's Charge ran out of steam on Cemetery Ridge. The failure of Gen. Lee's attempt to break the center of the Union line led to the Confederate retreat the following day. The South would never again mount an offensive in the North.
The name has nothing to do with the Battle of Gettysburg, but everything to do with a very large black snake that lived in the rocks.